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Cause why the rate of FE services is 125 Mbit/s but not 100 Mbit/s as specified in standards

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When a board that has FE optical ports receives FE services, the port rate is 125 Mbit/s. The rate, however, needs to be converted using the 4B/5B encoding scheme. The rate will become 100 Mbit/s after the conversion is complete.

Other related questions:

When a board that has GE optical ports receives GE services, the port rate is 1.25 Gbit/s. The rate, however, needs to be converted using the 8B/10B encoding scheme. The rate will become 1000 Mbit/s after the conversion is complete.

Yes, a TOM board supports 622 Mbit/s services.
When functioning as a tributary board, a TOM board performs mutual conversion between ODU0/ODU1 signals and signals at rates in the range of 100 Mbit/s to 2.67 Gbit/s on the client side.
When functioning as an OTU board, a TOM board performs mutual conversion between OTU1 signals and signals at rates in the range of 100 Mbit/s to 2.67 Gbit/s on the client side.